Country music artist Eric Church performed and discussed his song "Johnny" on The Tonight Show starring Jimmy Fallon Sunday. "Johnny, oh Johnny, where did you go? "The hardest thing I've ever done in my life -- we had a school shooting in Nashville at the Covenant School, and dropping my -- I have two boys, 13 and 10 -- and the day after that school shooting, dropping them off at school was the hardest thing I've ever done," he told Fallon, explaining the meaning behind the song. He said that in the background, "Devil Went Down to Georgia" by Charlie Daniels was playing. And I went home and I wrote 'Johnny,'" he said.